Update dreamfactory/df-email requirement from ~0.8.3 to ~0.8.4
Update dreamfactory/df-email requirement from ~0.8.3 to ~0.8.4

Updates the requirements on [dreamfactory/df-email](https://github.com/dreamfactorysoftware/df-email) to permit the latest version.
- [Release notes](https://github.com/dreamfactorysoftware/df-email/releases)
- [Changelog](https://github.com/dreamfactorysoftware/df-email/blob/master/CHANGELOG.md)
- [Commits](https://github.com/dreamfactorysoftware/df-email/compare/0.8.3...0.8.4)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
dreamfactorysoftware/df-aws